3 week old kitten without mom.. ?

I took in a 3 week old kitten from my friends neighbor who didn't know how to care for them (her other siblings died because of it :() there mom was hit by a car so I am bottle feeding her and caring for her until she is old enough to live out on there farm. She is getting sheeps milk every 4 to 5 hours and a little bit of wellness canned food every other feeding. She still needs help going to the bathroom (she wasn't in the best of shape when I got her) i've never done this before but am learning and she is doing much better :). I wouldn't mind some advice from someone who's done this before!? I would appreciate anything! Thanks!